Anteros Metals talks Seagull drilling work

Executive Summary

• Anteros Metals provided a Phase 1 drilling progress update at its Seagull Critical Minerals Project in Ontario, operated by Rift Minerals Inc. under an option agreement allowing Anteros to earn up to a 49% interest.
• Drill hole RM26-01 has advanced to approximately 670 metres depth (target ~1,350 metres) and intersected the basal contact of the Seagull mafic-ultramafic intrusion at ~612.5 metres, transitioning into Archean basement rocks.
• Visual observations include trace orthomagmatic-style sulphide mineralization and native copper near the contact, with serpentinized lherzolite lithologies identified as favorable for naturally occurring hydrogen evaluation. All laboratory assay results are currently pending.

Key Details

• Project Location: Seagull Critical Minerals Project, ~80 km northeast of Thunder Bay, Ontario.
• Option Agreement: Rift Minerals Inc. is the operator under an agreement announced Oct. 9, 2025, granting Anteros the right to earn up to a 49% interest in the project.
• Drilling Progress: Phase 1 hole RM26-01 is advancing on a two-shift basis, currently at ~670 metres depth with a planned target of ~1,350 metres.
• Geological Intersection: Basal contact of the Seagull mafic-ultramafic intrusion intersected at ~612.5 metres depth, transitioning into Archean basement rocks of the Quetico subprovince (quartz-feldspar biotite schist).
• Mineralization Observations: Trace orthomagmatic-style sulphide mineralization observed in the 9 metres immediately above the basal contact (disseminated blebs, 2–4 mm). Trace native copper locally observed along alteration veinlets.
• Lithology & Gas Potential: Ultramafic intervals include serpentinized lherzolite, favorable for evaluating naturally occurring hydrogen systems. Gas-handling and monitoring equipment is installed on-site for ongoing sampling.
• Historical Context: 1998–2012 exploration included ~20,000 metres of diamond drilling reporting disseminated to semi-massive sulphide mineralization containing Ni, Cu, and PGEs along the intrusion's basal contact (historical, unverified by Anteros).
• 2024 ANT Survey: Ambient noise tomography outlined contrasting velocity domains interpreted as lithological and alteration variations; Phase 1 drilling aims to provide the first subsurface evaluation of the deeper ANT anomaly.
• Current Status: All observations are visual in nature; laboratory assay results are pending.

Notable Quotes

• "Intersecting the basal contact in the phase 1 drill hole is an important step in advancing the Seagull project," said Trumbull Fisher, chief executive officer of Anteros. "This confirms the geological architecture at depth and allows us to continue drilling toward the deeper portions of the intrusion while systematically evaluating the project's critical minerals and gas potential."